/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.teiid.query.sql.lang;

import org.teiid.query.sql.LanguageObject;

/**
 * This interface defines a common interface for all SQL objects
 * that contain subqueries.
 */
public interface SubqueryContainer<T extends Command> extends LanguageObject {

    public static interface Evaluatable<T extends Command> extends SubqueryContainer<T> {
        boolean shouldEvaluate();

        void setShouldEvaluate(boolean b);
    }

    /**
     * Returns the subquery Command object
     * @return the subquery Command object
     */
    T getCommand();

    /**
     * Sets the subquery Command object
     * @param command the subquery Command object
     */
    void setCommand(T command);

}
